Methylated β-cyclodextrin (Me-β-CD) was used to complex a free-radical photoinitiator, 2-hydroxy-2-methyl-1-phenylpropan-1-one (1), yielding the water-soluble 1:1 host/guest complex 1a. The structure of complex 1a was verified by means of IR, UV/vis adn 1 H NMR spectroscopy. The influence of Me-β-CD as the host on the photopolymerization kinetics of N-isopropylacrylamide was studied. Compared to the photopolymerization carried out under nearly identical conditions but without cyclodextrin, an increase in the polymerization rate was registered in the presence of complex 1a.
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Alupei et al. (2002) studied this question.
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